You will never believe until you give it a trial. This tweak has been rock in my web forum www.9jagang.com for a while and i decided to share it here too, for the benefit of my blog fans too.
About nine month ago, i posted a tweak on How to Get Airtel 1GB Databundle For Just 1200, which is still blazing.
Few days ago I posted a tweak on How to Get Unlimited Megabytes on Airtel With Just #100,
the tweak has been circulating and blazing like hell for the past few
weeks and is yet unblocked, but is too stressful to get urge Megabytes
or Gigabytes with that, as it has been brought just 10mb per dial.
Here is another one that will not take too much of your time to get urge Gigabytes like 10gb, 20gb and more with just #1,200.
This is for the people who have been subscribed to Airtel Blackberry
monthly plan of 1GB with #1,200 and also for those who can avoid to
sacrifice that #1,200 to get that urge Unlimited Gigabytes. The tweak is
working on all types of phones and PC/Tablet
This is real ooo, check out the screenshot of mine:

Just follow the below steps to get it done on your Airtel SIM.

REQUIREMENTS. You must have an Etisalat Sim Near . You must have nothing less or more than 1,200 Naira on Your Airtel SIM.

TO GET UNLIMITED GIGABYTES ON YOUR AIRTEL
Call Your Etisalat line with Your Airtel.. While it is ringing, Dial *440*4#,
You will get an error message. Do not mind them, terminate the call,
Check Your Balance with *141*712*0# or *123*10#, Your money will still
be intact and you will be given 1GB!

Repeat the step to get as many Gigabytes as possible.

I got 10GB this morning Using this Simple Tweak as you can see in the above screenshot.

Note: The total amount before trying the tricks must be #1,200 sharp, It
will never work if the Airtime on your Airtel Sim is more than #1,200
i.e. # 1,201, #1,205, #1,250 e.t.c.
It must be # 1,200 Sharp...

I hope this information helps?
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Wen did you post this stuff? I want to be sure it's still valid today 3rd of June 2013 as most post like that would've been worked upon by the company and blocked. I wish to try it too but wat if I already have unfinished data on the sim that will expire in september 2013?